I use base16-vim and this update cases vim to spit out hundreds of errors on startup. I'm not sure what changed but it doesn't appear entirely compatible and suitable for stable :/
It is still somewhat usable when I hit ^C-Enter.
Well, this breaks it for me. Only latin letters show up in all apps after upgrading to this. Downgrading back to ibus-hangul-1.5.0-12.fc28.x86_64.rpm fixed the problem.
I hesitate to open a bug since it could be something is wrong with my system because no Japanese input, for instance, ever worked for me -- they behave just like Korean with this update. Simple methods like Czech or Farsi work fine, though.
Tested via MBS tools. Seems to work fine.